Patent GB-836218-A (GB)
Title: Improvements in or relating to the manufacture of thixotropic materials
Inventor: COX PHILIP DUNCAN
IPC: C09F7/00
Filed: 1957-01-01
Abstract: Thixotropic products are obtained by heating a vegetable oil, not containing combined ketoacids, which has been partially homopolymerized to give a product of viscosity not less than 5 poises, with 0.5-20% by weight of the oil of hydrazine or an aliphatic diprimary amine containing an even number of carbon atoms. Suitable partially polymerized oils are varnish, dehydrated castor, bodied tobacco seed, soybean, chinawood and linseed stand oils. Hydrazine may be used as the hydrate, and other suitable amines are ethylene, tetramethylene, hexamethylene and decamethylene diamines. In a modification of the process, the oils are not homopolymerized, but copolymerized with styrene, a  - methylstyrene, cyclopentadiene, vinyl toluene, methyl methacrylate or acrylonitrile, the product so obtained being treated with an aliphatic diprimary amine containing an even number of carbon atoms as before, but not in this case with hydrazine.  If required, the products obtained in either case may be heat blended with alkyd resins.ALSO:Thixotropic products are obtained by heating a vegetable oil, not containing combined ketoacids, which has been partially homopolymerized to give a product of viscosity not less than 5 poises, with 0.5-20% by weight of the oil of hydrazine or an aliphatic diprimary amine containing an even number of carbon atoms.  Suitable partially polymerized oils are varnish, dehydrated castor, bodied tobacco-seed, soybean, chinawood and linseed stand oils.  Hydrazine may be used as the hydrate, and other suitable amines are ethylene, tetramethylene, hexamethylene and decamethylene diamines.  In a modification of the process, the oils are not homopolymerized but are copolymerized with styrene, a -methylstyrene, cyclopentadiene, vinyltoluene, methyl methacrylate or acrylonitrile, the product so obtained being treated with an aliphatic diprimary amine containing an even number of carbon atoms as before, but not in this case with hydrazine.  The products obtained in either case may be heat blended with alkyd resins.  In examples: (12) dehydrated castor oil and styrene are copolymerized in the presence of lauryl mercaptan and di-tert. butyl peroxide, and the product is reacted with ethylene diamine; (13) a drying oil-cyclopentadiene copolymer is treated with ethylene diamine; (14) a linseed oil-styrene copolymer is treated with hexamethylene diamine; (15) a drying oil-cyclopentadiene copolymer is reacted with hexamethylene diamine; (16) dehydrated castor oil and methyl methacrylate are copolymerized in presence of di-tert. butyl peroxide and the product is reacted with ethylene diamine; (17) varnish linseed oil and acrylonitrile are copolymerized in presence of di-tert. butyl peroxide and the product is reacted with ethylene diamine; (18) the product of (12) is heated in solution with a soybean oil alkyd until homogeneous; (19) the product of (15) is heated until homogeneous with a long-oil linseed/pentaerythritol alkyd; (27) linseed stand oil, a cyclopentadiene-oil copolymer and aqueous ethylene diamine are reacted together; (28) the reaction product obtained by refluxing together a solution in toluene of coconut oil and vinyl toluene in the presence of tert. butyl hydroperoxide is reacted with aqueous ethylene diamine; (29) linseed stand oil and styrene are copolymerized in the presence of di-tert. butyl peroxide and the product is reacted with aqueous ethylene diamine; and (30) a terpolymer obtained by copolymerizing dehydrated castor oil with styrene in the presence of di-tert. butyl peroxide, followed by further polymerization of the product so obtained with methyl methacrylate and di-tert. butyl peroxide, is reacted with aqueous ethylene diamine.